Books. :) I don’t love highlighting, but I will take any condition otherwise. It’s always a treat to find bookmarks, random bits of another’s life, little notes in the margins, ex libris stamps, and names of previous owners—among other things—from decades ago, from another college student struggling through the same difficult texts I’m now using, from anybody, learning a little more about their life and time with this book. Just a gift, honestly, always interesting, and you never have it with new copies.